[Therion] needed double shot - exclude from cave length

Hello, if I have a leg where I need to separate shots (from the one point I don`t reach a continuative part) and I want to exclude the one from the calculation of the cave-length. What have I to write in my .th-File in the data-lines to exclude it from the calculation of the length but not from the centerline? I think it is simple, but I have found no idea in the wiki. Regards Markus